期刊文献+
共找到42篇文章
< 1 2 3 >
每页显示 20 50 100
Effective photocatalytic conversion of formic acid using iron,copper and sulphate doped TiO_(2) 被引量:4
1
作者 ZOUHEIR Morad TANJI Karim +3 位作者 NAVIO Jose Antonio HIDALGO María Carmen JARAMILLO-PAEZ Cesar Augusto KHERBECHE Abdelhak 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第11期3592-3607,共16页
In this paper,the combined addition of copper or iron and sulphate ions onto TiO_(2) prepared by a simple sol-gel method is studied for formic acid photocatalytic conversion.A wide structural and morphological charact... In this paper,the combined addition of copper or iron and sulphate ions onto TiO_(2) prepared by a simple sol-gel method is studied for formic acid photocatalytic conversion.A wide structural and morphological characterization of the different photocatalysts was performed by X-ray diffraction(XRD),N_(2)-physisorption for BET surface area measurements,scanning and transmission electronic microscopies(SEM and TEM),UV-Vis diffuse spectroscopy(DRS)and X-ray photoelectron spectroscopy(XPS),in order to correlate the physico-chemical properties of the materials to their photocatalytic efficiencies for formic acid oxidation.Results have shown important differences among the catalysts depending on the metal added.Sulphated TiO_(2)/Cu(1%Cu)was the best photocatalyst obtaining about 100% formic acid conversion in only 5 min.The appropriate physico-chemical features of this photocatalyst,given by the addition of combined copper and sulphate ions,explain its excellence in photocatalytic reaction. 展开更多
关键词 COPPER IRON sulphatION DOPING TiO_(2) PHOTOCATALYSIS
下载PDF
纳米SiO_(2)与VAE复合改性水泥基材料的耐久性能 被引量:3
2
作者 王智鑫 梅军鹏 +2 位作者 廖宜顺 李海南 牛寅龙 《建筑材料学报》 EI CAS CSCD 北大核心 2023年第6期687-696,共10页
研究了单掺乙烯-醋酸乙烯酯共聚乳胶粉(VAE)和复掺VAE/纳米SiO_(2)(NS)对水泥基材料抗氯离子渗透性能、抗硫酸盐侵蚀性能和吸水率的影响,并通过X射线衍射仪、热分析仪、扫描电子显微镜、压汞仪和红外光谱仪等探究了其作用机理.结果表明... 研究了单掺乙烯-醋酸乙烯酯共聚乳胶粉(VAE)和复掺VAE/纳米SiO_(2)(NS)对水泥基材料抗氯离子渗透性能、抗硫酸盐侵蚀性能和吸水率的影响,并通过X射线衍射仪、热分析仪、扫描电子显微镜、压汞仪和红外光谱仪等探究了其作用机理.结果表明:单掺VAE和复掺VAE/NS均可提高材料的抗氯离子渗透性能以及抗硫酸盐侵蚀性能,降低其总吸水率,且复掺效果优于单掺;单掺VAE可以改善材料的水化特性,有害孔和多害孔减少了65.3%,但增大了最可几孔径和界面过渡区的钙硅比;复掺VAE/NS可进一步改善材料的水化特性,有害孔和多害孔减少了82.6%,提高了水化硅酸钙(C-S-H)的生成量和聚合度,增强了材料的耐久性能. 展开更多
关键词 纳米SiO_(2) 乙烯-醋酸乙烯酯共聚乳胶粉 氯离子渗透 硫酸盐侵蚀 吸水率 孔结构
下载PDF
Morphological Characterization of γ-Al_2O_3 Membranes Fabricated from Ammonium Aluminum Sulphate
3
作者 张良苗 冯永利 +1 位作者 陆文聪 陈念贻 《Journal of Rare Earths》 SCIE EI CAS CSCD 2007年第S1期410-414,共5页
Supported γ-Al2O3 membranes without defects were prepared by the sol-gel procedure. The sol-gel method involved peptization of a boehmite (AlOOH) sol prepared from ammonium aluminium sulphate. The morphology of the s... Supported γ-Al2O3 membranes without defects were prepared by the sol-gel procedure. The sol-gel method involved peptization of a boehmite (AlOOH) sol prepared from ammonium aluminium sulphate. The morphology of the supported membranes was characterized by scanning electron microscopy (SEM) and 3D rotational microscopy. Furthermore, the effects of different preparing conditions on morphological characteristics of the membrane were also investigated. The results show that PVA is a good crack-preventing agent and the morphology of supported membranes is affected by many factors, such as Al2O3 and PVA contents of the sol, drying and sintering procedures and intrinsic defects on the substrate surface. 展开更多
关键词 supported γ-Al_2O_3 membrane ammonium aluminum sulphate sol-gel method morphology
下载PDF
Crystallization Kinetics of Potassium Sulphate in Aqueous System Mg2+,K+//Cl,SO42--H2O
4
作者 XIANG Jun CHENG Penggao +2 位作者 ZHANG Lei TANG Na WANG Xuekui 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2014年第S1期383-383,共1页
As an excellent chemical fertilizer,Potassium Sulphate(K2SO4)could provide both potassium and sulfur elements for crops.However,it is well known that potassium resource is very poor in China.To understand the Crystall... As an excellent chemical fertilizer,Potassium Sulphate(K2SO4)could provide both potassium and sulfur elements for crops.However,it is well known that potassium resource is very poor in China.To understand the Crystallization Kinetics(CK)of K2SO4could be conducive to utilize the limited potassium resource,promote the yield and purity of K2SO4.In this study saturated solution of potassium sulphate was prepared according to the phase diagram of Mg2+、 展开更多
关键词 H2O Crystallization Kinetics of Potassium sulphate in Aqueous System Mg SO Cl SO4
下载PDF
双碳背景下的废盐制碱工艺研究进展
5
作者 曹俊雅 张莉昕 +3 位作者 罗晨辉 刘猛 田兴 宋恕哲 《现代化工》 CAS CSCD 北大核心 2024年第4期40-44,共5页
综述了以卤盐和硫酸盐废盐为原料制碱的工艺路线及进展,对比分析不同废盐制碱工艺的现状和潜在问题。卤盐制碱工艺相对成熟,但仍然存在能耗较高和流程复杂等不足;利用硫酸盐制碱为废盐制碱提供了一条新思路,可与碳利用相结合,使生产过... 综述了以卤盐和硫酸盐废盐为原料制碱的工艺路线及进展,对比分析不同废盐制碱工艺的现状和潜在问题。卤盐制碱工艺相对成熟,但仍然存在能耗较高和流程复杂等不足;利用硫酸盐制碱为废盐制碱提供了一条新思路,可与碳利用相结合,使生产过程更经济、更清洁,促进双碳目标的实现。总结并展望以硫酸钠和CO_(2)为原料制碱的发展前景。 展开更多
关键词 CO_(2) 硫酸钠 废盐 纯碱
下载PDF
气相中芥子气模拟剂2-CEES在SO_4^(2-)/TiO_2上的光催化消除 被引量:8
6
作者 韩世同 习海玲 +1 位作者 王绪绪 付贤智 《环境科学》 EI CAS CSCD 北大核心 2005年第3期130-134,共5页
与传统洗消法相比,光催化技术消除军用毒剂具有高效和无二次污染等优点,但TiO2 的活性较低且易于失活以致难于实际使用.采用稀硫酸对TiO2 进行表面修饰制备出了SO2 -4/TiO2 催化剂,在连续流动微分反应器上考察其对芥子气模拟剂2 chloro... 与传统洗消法相比,光催化技术消除军用毒剂具有高效和无二次污染等优点,但TiO2 的活性较低且易于失活以致难于实际使用.采用稀硫酸对TiO2 进行表面修饰制备出了SO2 -4/TiO2 催化剂,在连续流动微分反应器上考察其对芥子气模拟剂2 chloroethylethylsulfide(2 CEES)的光催化降解活性和稳定性,并与TiO2 进行了比较.结果表明,硫酸化处理不但可提高TiO2 的活性也可提高其活性稳定性,其中以2 0 0℃焙烧所得样品ST2 0 0的性能最好.还研究了反应温度和水蒸气对ST2 0 0上2 CEES光催化降解的影响,发现在90℃反应,催化剂有较高的活性和稳定性;当给2 CEES初始浓度<6 1 μL·L-1 的体系中添加30 . 5mL·L-1 的水蒸气时,催化剂可维持长久的高活性.还发现将SO2 -4/TiO2 负载在γAl2 O3 、SiO2 和木质活性炭(AC)上可提高SO2 -4/TiO2 的活性和稳定性,其中以SiO2 载体最佳. 展开更多
关键词 光催化 2-CEES 酸化TiO2 负载化
下载PDF
四川盆地东北部三叠系飞仙关组高含硫气藏H_2S成因研究 被引量:143
7
作者 王一刚 窦立荣 +2 位作者 文应初 张静 刘划一 《地球化学》 CAS CSCD 北大核心 2002年第6期517-524,共8页
四川盆地东北部宣汉-开县地区的下三叠统飞仙关组气藏埋深3000~4500m,地温在100℃左右,天然气中H2S含量为12%~17%。这些H2S为飞仙关组气藏附近的硬石膏经硫酸盐热化学还原作用(TSR)而成。与TSR有关的硬石膏、H2S、S0和FeS2的δ34S分别... 四川盆地东北部宣汉-开县地区的下三叠统飞仙关组气藏埋深3000~4500m,地温在100℃左右,天然气中H2S含量为12%~17%。这些H2S为飞仙关组气藏附近的硬石膏经硫酸盐热化学还原作用(TSR)而成。与TSR有关的硬石膏、H2S、S0和FeS2的δ34S分别为+30.4‰、+12.9‰、+19.1‰和+19.4‰,交代硬石膏的方解石的δ13C为-7.26‰,δ18O为-6.41‰,其内所含两相流体包裹体的均一温度为109~151℃。这些高含硫气藏的天然气和储层沥青的热演化程度比其他地区飞仙关组气藏的更高。该区飞仙关组最大埋藏温度超过180℃,但由于后期构造抬升,大于140℃地温的埋藏时间小于20Ma,故气藏H2S含量低于20%。 展开更多
关键词 飞仙关组 气藏 硫化氢 四川盆地 储层 硫化氢
下载PDF
杭锦2~#土复合材料的制备及对磷酸根吸附性能 被引量:2
8
作者 陈丽萍 段毅文 刘玉红 《化学工程》 CAS CSCD 北大核心 2011年第2期83-86,共4页
以寻求廉价而高效的吸附材料为目的,研究了利用聚合硫酸铝改性杭锦2#土制备复合吸附剂的方法。用此吸附剂对生活废水中的磷酸根进行吸附,讨论了磷酸根浓度、溶液pH值、温度对吸附容量的影响。结果表明:增加初始磷浓度,去除率下降,吸附... 以寻求廉价而高效的吸附材料为目的,研究了利用聚合硫酸铝改性杭锦2#土制备复合吸附剂的方法。用此吸附剂对生活废水中的磷酸根进行吸附,讨论了磷酸根浓度、溶液pH值、温度对吸附容量的影响。结果表明:增加初始磷浓度,去除率下降,吸附量和吸附平衡时间增加;溶液pH值为6—10时复合吸附剂对磷酸根的去除效果最好;吸附能力随温度的升高而减小;Temkin方程更适合描述磷酸根在杭锦2#土-聚合硫酸铝复合吸附剂上的吸附行为,杭锦2#土复合吸附剂是良好的磷吸附剂。 展开更多
关键词 杭锦2#土 聚合硫酸铝 磷酸根 吸附
下载PDF
孕妇外周血浆中艾杜糖-2-硫酸酯酶活性测定在黏多糖贮积症Ⅱ型无创产前诊断中的应用评价 被引量:3
9
作者 姚凤霞 张为民 +3 位作者 施惠平 邱正庆 孟岩 黄尚志 《生殖医学杂志》 CAS 2015年第4期261-266,共6页
目的探讨黏多糖贮积症Ⅱ型非损伤性产前诊断途径。方法测定36例孕妇孕前、孕早期和孕中期外周血浆中艾杜糖-2-硫酸酯酶(IDS)活性变化趋势,同时,测定胎儿绒毛组织或经培养羊水细胞中IDS酶活性,并提取胎儿DNA,进行胎儿性别鉴定和IDS基因... 目的探讨黏多糖贮积症Ⅱ型非损伤性产前诊断途径。方法测定36例孕妇孕前、孕早期和孕中期外周血浆中艾杜糖-2-硫酸酯酶(IDS)活性变化趋势,同时,测定胎儿绒毛组织或经培养羊水细胞中IDS酶活性,并提取胎儿DNA,进行胎儿性别鉴定和IDS基因分析。结果有创产前诊断检出19例正常胎儿(7例男性不受累胎儿、12例女性非携带者胎儿)、7例男性受累胎儿、9例女性携带者胎儿和1例双胎(一男一女,不受累);正常胎儿孕母在孕前、孕早、中期血浆中IDS的活性分别为283.4±81.6、470.5±89.4、507.9±81.0nmol/4h·ml(男性不受累胎儿)和306.0±85.5、455.8±129.4、513.3±157.6nmol/4h·ml(女性非携带者胎儿),均显著高于男性受累胎儿和女性携带者胎儿孕母同期血浆IDS活性(分别为160.5±47.5、145.8±36.8、144.9±45.8nmol/4h·ml和214.9±74.8、327.6±133.4、375.3±120.4nmol/4h·ml)(P<0.05);正常胎儿和女性携带者胎儿孕母血浆IDS活性随着孕周的增加持续升高(P<0.05),但女性携带者胎儿组升高的幅度较正常胎儿组小;当为男性受累胎儿时,孕妇血浆IDS活性早期即显示低于孕前,且随着孕周的增加,酶活性持续降低。结论孕妇外周血中IDS活性测定可用于黏多糖贮积症Ⅱ型的非损伤性产前诊断。 展开更多
关键词 黏多糖贮积症Ⅱ型 非损伤性 产前诊断 艾杜糖-2-硫酸酯酶
下载PDF
丁酸2-戊酯的合成工艺 被引量:3
10
作者 崔玉民 《河南科技大学学报(自然科学版)》 CAS 2005年第1期97-99,共3页
以NaHSO4·H2O为催化剂,通过正丁酸与2 戊醇反应合成了丁酸2 戊酯。讨论了影响酯化率的主要因素,实验结果表明,当催化剂用量为0.6g,醇酸摩尔比为1.4∶1,反应温度为125℃,反应时间为3h时,平行实验酯化率的平均值可达97.9%。该工艺具... 以NaHSO4·H2O为催化剂,通过正丁酸与2 戊醇反应合成了丁酸2 戊酯。讨论了影响酯化率的主要因素,实验结果表明,当催化剂用量为0.6g,醇酸摩尔比为1.4∶1,反应温度为125℃,反应时间为3h时,平行实验酯化率的平均值可达97.9%。该工艺具有催化剂价廉易得,催化效果好,用量少,易分离,步骤少,操作简单,三废少,收率高等优点。 展开更多
关键词 酯化率 合成工艺 催化剂用量 收率 反应温度 正丁酸 醇酸摩尔比 戊醇 平均值 催化效果
下载PDF
2-氯甲基-4-甲氧基-7-甲基-6,7-二氢噻吩[2,3-d]嘧啶的合成 被引量:2
11
作者 陈学明 陈彦萍 姜日善 《延边大学学报(自然科学版)》 CAS 2006年第3期181-183,191,共4页
以甲基丙烯酸乙酯、巯基乙酸乙酯和氯乙腈为原料高产率地合成了两种新型导电高分子单体化合物,并通过核磁氢谱、核磁碳谱、质谱等确定了它们的结构.它们分别为-2-氯甲基-4-羟基-7-甲基-6,7-二氢噻吩[2,3-d]嘧啶(A),2-氯甲基-4-甲氧基-7... 以甲基丙烯酸乙酯、巯基乙酸乙酯和氯乙腈为原料高产率地合成了两种新型导电高分子单体化合物,并通过核磁氢谱、核磁碳谱、质谱等确定了它们的结构.它们分别为-2-氯甲基-4-羟基-7-甲基-6,7-二氢噻吩[2,3-d]嘧啶(A),2-氯甲基-4-甲氧基-7-甲基-6,7二-氢噻吩[2,3-d]嘧啶(B). 展开更多
关键词 甲基丙烯酸乙酯 巯基乙酸乙酯 氯乙腈 硫酸二甲酯
下载PDF
Potassium sulphate induces resistance of rice against the rootknot nematode Meloidogyne graminicola 被引量:2
12
作者 LIU Mao-Yan PENG De-liang +9 位作者 SU Wen XIANG Chao JIAN Jin-zhuo ZHAO Jie PENG Huan LIU Shi-ming KONG Ling-an DAI Liang-ying HUANG Wen-kun LIU Jing 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2022年第11期3263-3277,共15页
Potassium(K),an important nutrient element,can improve the stress resistance/tolerance of crops.The application of K in resisting plant-parasitic nematodes shows that the K treatment can reduce the occurrence of nemat... Potassium(K),an important nutrient element,can improve the stress resistance/tolerance of crops.The application of K in resisting plant-parasitic nematodes shows that the K treatment can reduce the occurrence of nematode diseases and increase crop yield.However,data on K_(2)SO_(4)induced rice resistance against the root-knot nematode Meloidogyne graminicola are still lacking.In this work,K_(2)SO_(4)treatment reduced galls and nematodes in rice plants and delayed the development of nematodes.Rather than affecting the attractiveness of roots to nematodes and the morphological phenotype of giant cells at feeding sites,such an effect is achieved by rapidly priming hydrogen peroxide(H_(2)O_(2))accumulation and increasing callose deposition.Meanwhile,galls and nematodes in rice roots were more in the potassium channel OsAKT11 and transporter OsHAK5 gene-deficient plants than in wild-type,while the K_(2)SO_(4)-induced resistance showed weaker in the defective plants.In addition,during the process of nematode infection,the expression of jasmonic acid(JA)/ethylene(ET)/brassinolide(BR)signaling pathway-related genes and pathogenesis-related(PR)genes OsPR1 a/OsPR1 b was up-regulated in rice after K_(2)SO_(4)treatment.In conclusion,K_(2)SO_(4)induced rice resistance against M.graminicola.The mechanism of inducing resistance was to prime the basal defense and required the participation of the K^(+)channel and transporter in rice.These laid a foundation for further study on the mechanism of rice defense against nematodes and the rational use of potassium fertilizer on improving rice resistance against nematodes in the field. 展开更多
关键词 RICE Meloidogyne graminicola potassium sulphate induced resistance H_(2)O_(2) CALLOSE potassium channel and transporter
下载PDF
Indirect mineral carbonation of titanium-bearing blast furnace slag coupled with recovery of TiO_2 and Al_2O_3 被引量:19
13
作者 Lin Wang Weizao Liu +7 位作者 Jingpeng Hu Qiang Liu Hairong Yue Bin Liang Guoquan Zhang Dongmei Luo Heping Xie Chun Li 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2018年第3期583-592,共10页
Large quantities of CO2 and blast furnace slag are discharged in the iron and steel industry. Mineral carbonation of blast furnace slag can offer substantial CO2 emission reduction and comprehensive utilization of the... Large quantities of CO2 and blast furnace slag are discharged in the iron and steel industry. Mineral carbonation of blast furnace slag can offer substantial CO2 emission reduction and comprehensive utilization of the solid waste. This paper describes a novel route for indirect mineral carbonation of titanium-bearing blast furnace (TBBF) slag, in which the TBBF slag is roasted with recyclable (NH4)2SO4 (AS) at low temperatures and converted into the sulphates of various valuable metals, including calcium, magnesium, aluminium and titanium. High value added Ti-and Al-rich products can be obtained through stepwise precipitation of the leaching solution from the roasted slag. The NH3 produced during the roasting is used to capture CO2 from flue gases. The NH4HCO3 and (NH4)2CO3 thus obtained are used to carbonate the CaSO4-containing leaching residue and MgSO4-rich leaching solution, respectively. In this study, the process parameters and efficiency for the roasting, carbonation and Ti and Al recovery were investigated in detail. The results showed that the sulfation ratios of calcium, magnesium, titanium and aluminium reached 92.6%, 87% and 84.4%, respectively, after roasting at an AS-to-TBBF slag mass ratio of 2:1 and 350℃ for 2 h. The leaching solution was subjected to hydrolysis at 102℃ for 4 h with a Ti hydrolysis ratio of 95.7%and the purity of TiO2 in the calcined hydrolysate reached 98 wt%. 99.7% of aluminium in the Ti-depleted leaching solution was precipitated by using NH3. The carbonation products of Ca and Mg were CaCO3 and (NH4)2Mg(CO3)2·4H2O, respectively. The latter can be decomposed into MgCO3 at 100-200℃ with simultaneous recovery of the NH3 for reuse. In this process, approximately 82.1% of Ca and 84.2% of Mg in the TBBF slag were transformed into stable carbonates and the total CO2 sequestration capacity per ton of TBBF slag reached up to 239.7 kg. The TiO2 obtained can be used directly as an end product, while the Al-rich precipitate and the two carbonation products can act, respectively, as raw materials for electrolytic aluminium, cement and light magnesium carbonate production for the replacement of natural resources. 展开更多
关键词 Mineral carbonation CO2 sequestration Ti-bearing blast furnace slag Ammonium sulphate Titanium dioxide Aluminium oxide
下载PDF
聚乙二醇联合低剂量硫酸镁在2型糖尿病患者结肠镜肠道准备中的应用价值 被引量:14
14
作者 聂凯 方婕 吴锐枫 《现代肿瘤医学》 CAS 2019年第22期4014-4018,共5页
目的:探讨聚乙二醇联合低剂量硫酸镁在2型糖尿病患者结肠镜肠道准备中的应用价值。方法:前瞻性纳入120例2型糖尿病结肠镜肠道准备患者,随机分为常规组和联合组两组,每组60例。常规组采用聚乙二醇3 L分割剂量方案,联合组在常规组方案基... 目的:探讨聚乙二醇联合低剂量硫酸镁在2型糖尿病患者结肠镜肠道准备中的应用价值。方法:前瞻性纳入120例2型糖尿病结肠镜肠道准备患者,随机分为常规组和联合组两组,每组60例。常规组采用聚乙二醇3 L分割剂量方案,联合组在常规组方案基础上再口服50 ml 50%硫酸镁溶液。两组患者健康宣教和饮食调整方法相同。由一名单盲状态的内镜医师采用波士顿肠道准备评分量表(BBPS)评估两组患者肠道清洁质量,包括全结肠BBPS得分、肠道准备充分(BBPS≥6分,且各段结肠评分均≥2分)率、各段结肠(升结肠-盲肠段、横结肠-降结肠段、直肠-乙状结肠段)BBPS得分和BBPS<2分的比例,使用自制调查问卷评估两组患者肠道准备的耐受性和不良反应(恶心/呕吐、腹胀、腹痛、直肠烧灼感)。结果:联合组全结肠BBPS得分(7.7±1.3比7.1±1.5)、肠道准备充分率(90%比75%)显著高于常规组(P<0.05)。联合组升结肠-盲肠段(2.4±0.4比2.1±0.5)、横结肠-降结肠段(2.7±0.5比2.5±0.5)BBPS得分显著高于常规组(P<0.05),且上述2段结肠BBPS<2分患者比例(1.7%比11.7%;0比8.3%)显著低于常规组(P<0.05),两组直肠-乙状结肠段BBPS得分和BBPS<2分患者比例差异未见统计学意义(P>0.05)。两组肠道准备不良反应和耐受性差异未见统计学意义(P>0.05)。结论:聚乙二醇联合低剂量硫酸镁可以提高2型糖尿病患者结肠镜肠道准备质量,且并不增加不良反应发生风险。 展开更多
关键词 结肠镜检查 肠道准备 2型糖尿病 聚乙二醇 硫酸镁
下载PDF
CO_(2)饱和介质中碳源对管线钢SRB腐蚀行为的影响 被引量:1
15
作者 郭克星 赵红波 李泽轩(编译) 《焊管》 2022年第2期57-63,共7页
为探究碳源对油田环境下管线钢微生物腐蚀的机理,研究了不同浓度有机碳源在模拟CO_(2)饱和油田产出水中SRB细胞的存活情况及其对管线钢腐蚀行为的影响。结果显示,细胞数量随着碳源减少(carbon source reduction,CSR)而减少,但与100%CSR... 为探究碳源对油田环境下管线钢微生物腐蚀的机理,研究了不同浓度有机碳源在模拟CO_(2)饱和油田产出水中SRB细胞的存活情况及其对管线钢腐蚀行为的影响。结果显示,细胞数量随着碳源减少(carbon source reduction,CSR)而减少,但与100%CSR(极端碳饥饿)相比,80%CSR(中度碳饥饿)下存活的浮游细胞更多。即使在碳源饥饿后,细胞生存所需的能量可以通过胞外Fe氧化和胞内硫酸盐还原来提供。在局部腐蚀过程中形成氧化亚铁膜和FeS/MnS团聚体。失重和动电位极化曲线测试结果表明,与乳酸和柠檬酸盐同时存在的培养基相比,在80%CSR范围内培养时,钢的腐蚀更严重。在培养期末,观察到严重的钢溶解现象,这是由SRB主导的MIC(微生物腐蚀)和CO_(2)腐蚀造成的。 展开更多
关键词 管线钢 油田采出水 硫酸盐还原菌 微生物腐蚀 SRB生物膜 CO_(2)腐蚀
下载PDF
柱前衍生化法评价注射用奥美拉唑钠中EDTA-2Na·2H_(2)O含量差异 被引量:2
16
作者 刘晓强 汪嘉丽 张岩琛 《天津药学》 2022年第6期1-4,共4页
目的:评估市售不同企业生产的注射用奥美拉唑钠中二水合依地酸二钠(EDTA-2Na·2H_(2)O)含量差异。方法:采用Titank C18(250 mm×4.6 mm,5μm),以0.5%磷酸二氢铵(用磷酸调pH至3.0)为流动相A,乙腈为流动相B,梯度洗脱,检测波长为25... 目的:评估市售不同企业生产的注射用奥美拉唑钠中二水合依地酸二钠(EDTA-2Na·2H_(2)O)含量差异。方法:采用Titank C18(250 mm×4.6 mm,5μm),以0.5%磷酸二氢铵(用磷酸调pH至3.0)为流动相A,乙腈为流动相B,梯度洗脱,检测波长为254 nm,建立快速测定注射用奥美拉唑钠中EDTA-2Na·2H_(2)O量的柱前衍生化方法。并测定市售5个生产厂家15个批次注射用奥美拉唑钠中EDTA-2Na·2H_(2)O含量。结果:EDTA-2Na·2H_(2)O在10~200μg/ml的范围内线性关系良好(r=0.9999),重复性、中间精密度均满足要求,平均回收率为100.47%,RSD为0.78%,检测限为1μg/ml,定量限为3μg/ml。市售各厂家(A、B、C、E)与原研厂家(D)EDTA-2Na·2H_(2)O含量均在1.4 mg/支左右。结论:本文所建立的方法可用于测定注射用奥美拉唑钠中EDTA-2Na·2H_(2)O含量,本试验所测定的5个厂家所生产的注射用奥美拉唑钠中EDTA-2Na·2H_(2)O含量无明显差异。 展开更多
关键词 柱前衍生化法 注射用奥美拉唑钠 EDTA-2Na HPLC 硫酸铜
下载PDF
Endothelin-2 Differential Expression in Normal and Early-Stages of Colon Cancer Development
17
作者 Mariana Bianchi Javier Adur +3 位作者 Maria F. Izaguirre Silvia Viale Carlos L. Cesar Víctor H. Casco 《Journal of Cancer Therapy》 2013年第6期26-33,共8页
The endothelin family has been related with several pathological diseases including cardiovascular disorders, hypertension and cancer. However, little is known about endothelin system in early stages of colorectal can... The endothelin family has been related with several pathological diseases including cardiovascular disorders, hypertension and cancer. However, little is known about endothelin system in early stages of colorectal cancer and there are no studies evaluating differences in proximal and distal colon segments. To deepen in this issue, we have studied the endothelin’s family gene and protein expression in normal mice and early stage of a mice model of Azoxymethane (AOM) and Dextran Sodium Sulphate (DSS) induced colorectal cancer in proximal and distal segments. Additionally, using nonlinear microscopy (NLM) techniques, we have characterized collagen changes in early stages of cancer disease development. In the present study, we have found significant differential gene expression and protein localization between these colon regions, which allow us to hypothesize a new role for the ET-2 as an early marker of colon cancer development. 展开更多
关键词 Colon Cancer Endothelin-2 AZOXYMETHANE DEXTRAN Sodium sulphate
下载PDF
Morphological characterization of Al_2O_3 membrane fabricated by sol-gel dip-coating method
18
作者 徐占锋 张良苗 +3 位作者 陈念贻 陆文聪 张振 吴祖燊 《Journal of Shanghai University(English Edition)》 CAS 2006年第6期553-557,共5页
Alumina membranes without pinholes and cracks were prepared by the sol-gel process using anunordum aluminium sulphate as the starting material. The effects of different preparing conditions on morphology characteristi... Alumina membranes without pinholes and cracks were prepared by the sol-gel process using anunordum aluminium sulphate as the starting material. The effects of different preparing conditions on morphology characteristics of the membrane were investigated by scanning electron microscopy and 3D rotational microscopy. The preparing conditions include the amounts of drying control chemical additives (DCCA), sintering procedure and sol-gel concentration. The results showed that PVA is a good crack-preventing reagent and the morphology of supported membranes was affected by ninny factors, including Al2O3 concentration, PVA/Al2O3 ratio, heating rate, membrane thickness and intrinsic defects of the substrate surface. 展开更多
关键词 supported Al2O3 membrane ammonium aluminium sulphate sol-gel method morphology.
下载PDF
Study on Co-Effect of K<sub>2</sub>SO<sub>4</sub>Deposition and Low Concentration SO<sub>2</sub>on Performances of V<sub>2</sub>O<sub>5</sub>/AC Catalysts for Low Temperature SCR
19
作者 Xianlong Zhang Bowen Shi +4 位作者 Xueping Wu Zhanggen Huang Zhenyu Liu Baojun Yang Cuiping Zhang 《Advances in Chemical Engineering and Science》 2011年第4期176-182,共7页
Simulated compounds were prepared by loading K2SO4 onto V2O5/AC catalysts. Study the effect of K2SO4 on V1/AC catalysts in the presence of low concentration SO2. Transient response techniques, TPD was carried out. The... Simulated compounds were prepared by loading K2SO4 onto V2O5/AC catalysts. Study the effect of K2SO4 on V1/AC catalysts in the presence of low concentration SO2. Transient response techniques, TPD was carried out. The results indicated that the DeNO activity of V1/AC catalysts was decreased seriously in the early period of operation, but the deactivation was gradually diminished with SO2 adsorption and then, it was completely eliminated. For the sulphated catalysts (saturated catalysts by sulphate), their SCR activity were free from existence of gaseous SO2. the loss of activity about 10% caused by K2SO4 was found on them. The deactivation of K2SO4 deposited catalysts was due to the decrease of adsorbed and activated NH3, or some acid sites. 展开更多
关键词 Vanadium Oxide CATALYST SCR K2SO4 DEPOSITION Deactivation sulphated CATALYST
下载PDF
The relationship of serum HE4, CP2 and HCgp-39 levels with tumor malignancy in patients with endometrial carcinoma
20
作者 Yun-Xia Rao 《Journal of Hainan Medical University》 2017年第4期14-18,共5页
Objective:To study the relationship of serum human epididymis protein (HE4), cancer protein-2 (CP2) and human cartilage glycoprotein-39 (HCgp-39) levels with tumor malignancy in patients with endometrial carcinoma.Met... Objective:To study the relationship of serum human epididymis protein (HE4), cancer protein-2 (CP2) and human cartilage glycoprotein-39 (HCgp-39) levels with tumor malignancy in patients with endometrial carcinoma.Methods:A total of 90 patients with endometrial carcinoma treated in our hospital between May 2012 and August 2015 were collected and divided into early-to-mid (Ⅰ-Ⅲ stage) endometrial carcinoma group (n=59) and advanced (Ⅳ stage) endometrial carcinoma group (n=31) according to the pathological staging, and 34 patients with endometrial thickening who received uterine curettage in our hospital during the same period were selected as control group. The levels of HE4, CP2, HCgp-39 and tumor markers in serum as well as the mRNA expression of proliferation genes and invasion genes in tumor tissue were determined.Results:HE4, CP2, HCgp-39, CA125, CA19-9 and CEA levels in serum as well as Bcl2, Chk1, PIK1, HER2 and GDF-15 mRNA expression in tumor tissues of early-to-mid endometrial carcinoma group and advanced endometrial carcinoma group were significantly higher than those of control group while the miRNA-199a-3p, Bax, caspase3, BRCA1, Kiss-1 and KAI1 mRNA expression were lower than those of control group;HE4, CP2, HCgp-39, CA125, CA19-9 and CEA levels in serum as well as Bcl2, Chk1, PIK1, HER2 and GDF-15 mRNA expression in tumor tissues of advanced endometrial carcinoma group were significantly higher than those of early-to-mid endometrial carcinoma group while the miRNA-199a-3p, Bax, caspase3, BRCA1, Kiss-1 and KAI1 mRNA expression were lower than those of early-to-mid endometrial carcinoma group;serum HE4, CP2 and HCgp-39 levels were positively correlated with CA125, CA19-9, CEA, Bcl2, Chk1, PIK1, HER2 and GDF-15, and negatively correlated with miRNA-199a-3p, Bax, caspase3, BRCA1, Kiss-1 and KAI1. Conclusion:Serum HE4, CP2 and HCgp-39 levels can directly reflect the tumor malignancy in patients with endometrial carcinoma, and are expected to become the reliable means for tumor screening and treatment guidelines. 展开更多
关键词 ENDOMETRIAL carcinoma HUMAN EPIDIDYMIS protein Cancer protein-2 HUMAN CARTILAGE glycoprotein-39
下载PDF
上一页 1 2 3 下一页 到第
使用帮助 返回顶部